Form 4 Filing for 908 Devices Inc. - Officer/Director Stock Sale

Christopher D. Brown, a director at 908 Devices Inc. (MASS), reported the sale of 20,000 shares of Common Stock on June 3, 2026, pursuant to a Rule 10b5-1 trading plan adopted on November 24, 2025. The shares were sold at a weighted average price of $8.73, with individual transactions ranging from $8.61 to $8.86. Following this transaction, Mr. Brown holds 875,559 shares. The filing was made on June 4, 2026, signed by Mark S. Levine as Attorney-in-Fact. This transaction is classified as a direct ownership sale.